我知道已经有很多与“尝试使用已回收的位图”崩溃相关的问题，但是没有一个能帮助我。
细节如下：
- 此项目中任何地方都没有调用Bitmap.recycle()。
- 所有图像都使用Glide（4.11.0）加载。
- Glide调用都很简单，没有使用占位符。
- 崩溃似乎在切换片段时随机发生。
我能想到的唯一可能就是转换。这个项目中只有两个转换：
CircleTransformation（将图像剪裁为具有自定义半径的圆形）：
class CircleTransformation(private val radius: Float) : BitmapTransformation() {
companion object {
private const val ID = "com.project.transformation.circle"
private val ID_BYTES: ByteArray = ID.toByteArray()
}
public override fun transform(pool: BitmapPool, source: Bitmap, outWidth: Int, outHeight: Int): Bitmap {
val paint = Paint()
paint.isAntiAlias = true
paint.shader = BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
val halfWidth = source.width / 2f
val output = Bitmap.createBitmap(source.width, source.height, Bitmap.Config.ARGB_8888)
val canvas = Canvas(output)
canvas.drawCircle(
halfWidth,
(source.height / 2).toFloat(),
halfWidth * radius,
paint
)
return output
}
// Caching helpers
override fun equals(other: Any?): Boolean {
return other is CircleTransformation && other.hashCode() == hashCode()
}
override fun hashCode(): Int {
return ID.hashCode()
}
override fun updateDiskCacheKey(messageDigest: MessageDigest) {
messageDigest.update(ID_BYTES)
}
}
ClipWhiteTransformation（从图像中删除白边）：
class ClipWhiteTransformation() : BitmapTransformation() {
companion object {
private const val ID = "com.project.transformation.clipWhite"
private val ID_BYTES: ByteArray = ID.toByteArray()
// Config
const val white = 253 // White pixel, if all channels are equal or greater than this
const val transparent = 50 // Transparent pixel, if Less than this
}
public override fun transform(pool: BitmapPool, source: Bitmap, outWidth: Int, outHeight: Int): Bitmap {
val width = source.width - 1
val height = source.height - 1
val halfX = width / 2
val halfY = height / 2
var startY = 0
// Left Margin
var left = 0
for (x in 0 until halfX) {
val pixel = source.getPixel(x, halfY)
// Transparent?
if (Color.alpha(pixel) < transparent) continue
// Not white?
if (Color.red(pixel) < white || Color.green(pixel) < white || Color.blue(pixel) < white) {
left = x
if (x > 2) {
startY = 2
}
break
}
}
// Right Margin
var right = 0
for (x in 0 until halfX) {
val pixel = source.getPixel(width - x, halfY)
// Transparent?
if (Color.alpha(pixel) < transparent) continue
// Not white?
if (Color.red(pixel) < white || Color.green(pixel) < white || Color.blue(pixel) < white) {
right = x
if (x > 2) {
startY = 2
}
break
}
}
// Top Margin
var top = 0
for (y in startY until halfY) {
val pixel = source.getPixel(halfX, y)
// Transparent?
if (Color.alpha(pixel) < transparent) continue
// Not white?
if (Color.red(pixel) < white || Color.green(pixel) < white || Color.blue(pixel) < white) {
top = y
break
}
}
// Bottom Margin
var bottom = 0
for (y in startY until halfY) {
val pixel = source.getPixel(halfX, height - y)
// Transparent?
if (Color.alpha(pixel) < transparent) continue
// Not white?
if (Color.red(pixel) < white || Color.green(pixel) < white || Color.blue(pixel) < white) {
bottom = y
break
}
}
// Clip, scale and return
val newWidth = width - (left + right)
val newHeight = height - (top + bottom)
val scale = if (abs(newWidth - outWidth) > abs(newHeight - outHeight)) outWidth / newWidth.toFloat() else outHeight / newHeight.toFloat()
val matrix = Matrix().apply { setScale(scale, scale) }
return Bitmap.createBitmap(source, left, top, newWidth, newHeight, matrix, false)
}
// Caching helpers
override fun equals(other: Any?): Boolean {
return other is ClipWhiteTransformation && other.hashCode() == hashCode()
}
override fun hashCode(): Int {
return ID.hashCode()
}
override fun updateDiskCacheKey(messageDigest: MessageDigest) {
messageDigest.update(ID_BYTES)
}
}
最初使用了BitmapPool，但移除它并没有停止崩溃。
顺便说一下，这是用于加载图像的扩展程序：
fun ImageView.setURL(url: String,
@DrawableRes error: Int? = null,
@DrawableRes placeholder: Int? = null,
size: Int? = null,
options: ((RequestBuilder<Drawable>) -> Unit)? = null,
completion: ((resource: Drawable?) -> Unit)? = null) {
// No URL, use Placeholder if exists, if not, use the error image
if (url.isEmpty()) {
placeholder?.also{ setImageResource(it) } ?: run { error?.also{ setImageResource(it) } }
return
}
Glide.with(applicationInstance) // (I'm using an application instance directly here)
.load(url).apply {
completion?.also { completion ->
this.listener(object : RequestListener<Drawable> {
override fun onLoadFailed(e: GlideException?, model: Any?, target: Target<Drawable>?, isFirstResource: Boolean): Boolean {
completion(null)
return false
}
override fun onResourceReady(resource: Drawable?, model: Any?, target: Target<Drawable>?, dataSource: DataSource?, isFirstResource: Boolean): Boolean {
completion(resource)
return false
}
})
}
}
.apply { size?.also { this.override(it)} }
.apply { options?.invoke(this) }
.placeholder(placeholder ?: 0)
.error(error ?: 0)
.transition(DrawableTransitionOptions.withCrossFade(350))
.into(this)
}
很抱歉在这里粘贴了那么多代码（希望对某些人有用）。 这些转换器或加载器会导致崩溃吗？